The CAS Registry Mumber 121732-23-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,1,7,3 and 2 respectively; the second part has 2 digits, 2 and 3 respectively. Calculate Digit Verification of CAS Registry Number 121732-23: (8*1)+(7*2)+(6*1)+(5*7)+(4*3)+(3*2)+(2*2)+(1*3)=88 88 % 10 = 8 So 121732-23-8 is a valid CAS Registry Number.
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